ARM: omap2plus_defconfig: Enable EXTCON_GPIO_USB

This driver is needed for USB cable type detection on dra7-evm,
dra72-evm and am57xx-beagle-x15.
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/configs/omap2plus_defconfig

@@ -366,6 +366,7 @@ CONFIG_TI_EDMA=y
 CONFIG_DMA_OMAP=y
 # CONFIG_IOMMU_SUPPORT is not set
 CONFIG_EXTCON=m
+CONFIG_EXTCON_GPIO=m
 CONFIG_EXTCON_PALMAS=m
 CONFIG_TI_EMIF=m
 CONFIG_PWM=y